Valve-grinding machine.



W.' F. TRIPP..

\{A LVE GRINDING MACHINE. AgrucAnoN man ocT. 4. isms.l

Patented Feb. 12, 1918.

, xiv/fd f INVENTOR Milian T ZT'L'fa/v.

WITNESSES ATTORNEY w. nwe?.

VALVE GRINDING MACHINE.

APPLCATION FILED OCT. 4. 1916.

Patented Feb. 12, 1918.

WITNESSES ATTORNEY .spindle thereof with WILLIAM F. TRIPP, OF GREEN FIELD, MASSACHUSETTS.

VALVE-GRIN DIN G MACHINE.

Specification of Letters Patent. Patented Feb. 12, 1918.

Application led October 4, 1916. Serial No. 123,768.

To all wlwm it may concern.'

Be it known that I, WILLIAM F. Tiurr, a citizen of the United States, residing at Greenfield, in the county of Franklin and State of Massachusetts, have invented certain new and useful Improvements in Valve- Grinding Machines, of which the following is a specification.

This invention relates generally to grinding machines, and particularly to machines for grinding valves.

Primarily, the invention aims to provide a grinding mechanism which shall be of simple and improved construction, and by the use of which valves may be quickly, easily, and accurately ground or resurfaced. The invention l.has for a further object to provide a device of this character which embodies improved adjusting means, so as to enable the device to operatelupon valves of various sizes, shapes, and constructions, and to properly bevel the valve heads during the grinding operation. A still further object is to provide in a grinding device including a pair of relatively movable stocks, improved means for adjusting the stocks so that their frictional contacting elements will be properly disposed, as well as improved means for moving one of the stocks to engage or disengage its rotating member with the corresponding member of the adjacent stock. Still further objects reside in the arrangement of a device of the character described, which may be constructed of comparatively few, simple and readily assembled parts, all solconstrueted and arranged as to prevent wear, breakage or derangement of the same; which is equipped with means for operating the same either manually or bya motor or engine;l which includes improved means for readily accommodating valves of various sizes, shapes and configurations; and which will prove thoroughly practical and eflicient 1n use.

With these objects in view, together` with others which will appear as the description proceeds, the invention consists in the arrangement of a pair of relatively movable stocks, one equipped with a rotating ing element and the other having a spindle for the attachment of a valve to be ground, means upon the second stock for rotating the spindle, means for adjusting the second stock soas to dispose the valve held upon .lthe

its seat engaging surface properly disposed against the grinding grindelement, means for moving the grinding element into and out of engagement witlrthe valve carried by the second stock, and means for yieldably holding said grinding element engaged with the valve.

he invention consists further in the novel formation, combination and arrangement of parts, all as will be described more fully hereinafter, illustrated in the drawings, and particularly pointed out in the claims.

In the drawings Figure l is an elevational view of a grinding mechanism constructed in accordance with the invention, and illustrating the same ready for use;

Fig. 2 is a plan view of thedevice shown in Fig. l;

Fig. 3 is a sectional view taken substantially upon line 3 3 of Fig. 2, and with the grinding member removed;

Fig. 4 is a sectional view taken through the head stock, and showing the device with the valve removed;

Fig. 5 is a sectional view taken through the screw cap for holding the valve attached to the head stock;

Fig. 6 is a side elevation of the chuck used for retaining the valve stem to the head stock; and

Fig. 7 is a transverse sectional view taken through the device illustrated in Fig. 6.

eferring now more particularly to the drawings, 10 indicates a suitable table or base upon which the grinding mechanism is supported.

Arranged upon the table 10 is a wheel stand indicated generally at l1, the latter comprising a suitable standard, having a relatively wide base 12 rectangular in shape, and which is held upon the said table between two spaced parallel guide rails 13. These rails are secured to the table 10 by means of bolts or screws 14, and provide inturned fianges for engaging over the upper surface of the base 12 adjacent the longitudinal edges of the latter. `comprising the wheel stand is forked at its upper end as shown, and provides a pair of spaced alined barrels 15, cach equipped with a suitable bushing 16 supporting a rotatable spindle or shaft 17. This shaft has secured thereto, intermediate its ends, a belt pulley 18, through the medium of which rotary movement is imparted to the spindle from a suitable source of motive power. One end of the shaft or spindle 17 1s provided with a\ The standard tail stock so as to disengage 4justed in such and operation, I shall refer to the wheel stand l1 as the tail stock, and to the valve carrying mechanism as the head stock. When it is desired to grind a valve, the stem of the same is inserted in the hollow spindle 44 of the head stock, and the screw cap 50 tightened upon the nipple 46. This operation firmly holds the valve stem upon the spindle. The head stock is then adjusted upon the platform so that the beveled face of the valve head lies flush with the surface of the grinding wheel 21. Owing to the various degrees of inclination of the valve heads, it will be necessary to minutely adjust the head stop so as to dispose the valve head at the proper inclination.V In this respeet the graduations 39 upon the annular edge of the base 35 may be used to properly dispose the valve. the adjusting screw il is then operated to draw the platform 32 inwardly until the Valve engages the pe ripheral edge of the grinding wheel 2l.-

After proper adjustments have thus been made, the spindles upon. the head and tail stocks are set into operation, and proper grinding of the valve will take place. Uperation ot` the treadle or lever to which the bell crank E25 is connected will move the the grinding wheel carried thereby from the valve held by the head stock,

From the foregoing, it is apparent that valves of various types, sizes and shapes may be secured in the head stock and adinanner as to present its seating surface properly to the grinding element. It will he understood that valve holding spindles of various sizes and shapes may be employed in the barrel l2 of the head steelt so as to adapt the device to all types of valve stems. The mechanism may be operated either by hand or from a motor, engine or counter-shaft, it being understood that operation ot' the pulley 5.3 through the handle 57 creates rotation in the spindle 44.

` While the present illustration is that of the preferred embodiment oit' the invention, it is obvious that various changes in the minor detailsl of 'construction and arrangement of parts may be resorted to, if desired, without departing` from thespirit of the invention, or exceeding the scope of the claims, and the right to make such variation in construction is hereby reserved.

What is claimed is:`

l. In a grinding machine, the combination with a grinding element, of a platform mounted to slide laterally of said grinding element and adjacent one end thereof, a post, a stem rotatably mounted in said post and threaded into said platform for moving the latter, a stock carried by said platform and capable of moving upon a vertical axis, a spindle on said stock for supporting work to be engaged by said grinding element, and means for rotating said spindie.

2. In a grinding machine, the combination with a grinding element, a platform arranged adjacent said grinding element and capable of moving laterally thereof, means for moving said platform, a standard, a hase for said standard resting upon said platform, clips adjustably secured upon said platform and engaging over the edges ot' said base, a spindle carried bV said standard, means for securing work to a spindle to he engaged by saidgrinding element, and means for rotating said spindle.

3. In a grinding machine, a table, a tail stoel; hai/img'v a base, guide rails secured to said table and engaging over the edges of said hase to permit 'ot the latter moving therein, a grinding element upon said stock, the said base being provided with a notch, a bell crank pivoted upon said table and engaging at one end in paid notch, means for operating said bell crank, a spring connecting said bell crank and said table for normally holding said tail stock moved in one direction, and means for holding work in engagement with said grinding element.

ln testimony whereof l allix my signature in presence ot two witnesses.

WILLIAM F. TRIPP.

Witnesses:

Gnonor. A. RICHARDSON, lVAL'rnn M. A'rcincnsoN. 

